small {
    opacity: .6;
}

.text-muted {
    opacity: .6;
}

.clear {
    display: block;
    overflow: hidden;
}

.clearfix:after {
    content: "";
    height: 0;
    line-height: 0;
    display: block;
    visibility: hidden;
    clear: both;
}

.clearfix {
    zoom: 1;
}

.center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.y-center {
    display: flex;
    align-items: center;
}

.block {
    display: block;
}

.inline {
    display: inline;
}

.none {
    display: none;
}

.b-white {
    border-color: #ffffff;
}

.w-full {
    width: 100%;
}

.w-auto {
    width: auto;
}

.h-auto {
    height: auto;
}

.h-full {
    height: 100%;
}

.h-v {
    height: 100vh;
}

.h-v-5 {
    height: 50vh;
}

.pull-left {
    float: left;
}

.pull-right {
    float: right;
}

.w-40 {
    width: 40px;
    height: 40px;
    line-height: 40px;
    display: inline-block;
    text-align: center;
}